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-soteror named Nov. n, 1930 EDWARD WILLIAIS, I' CHARLEROI, .PNNSY'LV-ANIA, ASSIGNOB, BYDIESNEVASSIGNJ m T0 LAW-KNOX COMPANY, OF PITTSBURGH, PENNSYLVANIA, A Gonon- Honor-maman rUaNacn noon. v

Original lo. 1,990,606, dated November 6, 1928, Serial No. 299,274, ille'd Iuly 29, 1927. Application for I reissue med Hay 28, 1929.' Serial No. 385,585.v

It is the object of this invention to provide a" metal framed, refractor faced, water cooled furnace door, simp e in structure, easily fabricated, adequate, and durable.

A door embodying my invention is illustrated in the accompanying drawings. Fig.

. 1 is a di ammatic view, showing the door in front e evation, but with part of the reface broken away. Fig. 2 is a view lo in vertical section, on the plane II-II, Fig. 1. The door of a furnace in which very high temperatures are maintained,temperatures exceeding the melting point of iron,the

door of an open-hearth furnace, for instance,

must in that portion at least which is exposed y to the atmosphere of the furnace chamber, be formed of vhlghly refractory material. And, practically consldered, the material must be irebrick or material -of that class to which an the word refractory in more. specific sense has come to be applied as its designation. Such material, being 'of relatively brittle and friable nature, lacklngtensile strength and hardness, must, in order to constitute a mov- 2l able and durable door, be carried in a frame, and the frame must, under practical limitations, be of metal. And the frame of metal must, in order to endure the conditions of service, be made hollow and `be cooled by waequivalent substance circulating within it. Y

The frame of my door I make of rolled steel pipe, and the frame consists of a peripheral portion 1, ordinarily of rectangular contour, and of intermediate transversej portions, in the form of olie or more bars 2, extending across the space defined by the peripheral portion and at the ends opening into the pipe sections which constitute the peripheral portion. The tubular members forming the door are all integrally connected and form a continuous water space. The transverse bars are less in thickness, transversely through the door, than is the peripheral portion of .the l frame, and they are arranged on th'e outer side, as will be seen on consldering Flg. 2, so that theconductor walls on one side ofthe structure extend in common plane and on the Vother sideform a re-entrant" brick-receiving 6c [Sicli 'spacef'inay benhlled'solid with duced.

refractory material 3, and the inner face of the finished door may within the peripheral portion 1 of the frame present a contlnuous face` of refractory material.

The transverse bars 2 are spaced apart one from another and from the lengths of pipe of which the peripheral portion 1 is formed, to the end that the refractory body which faces .the door on the inside may extend into and fill the spaces, and that thus a more securely integrated and more durable door may be pro- The refractor built of bricks ofystan a-rd size, 9 inches x 1i/2 on the'face. vAccordingly I preferably form my d oor of rectangular rolled steel pipe of corres onding size, approximately 9 inches x 41/2. he rectangular periphery 1 of the door frame is formed of lengths of pipe set with the greater dimension (9 inches) extending in the direction of the thickness of the door. The lengths of pipe which form the transverse bars 2 are set with the smaller dimension (4l/2 inches) extending in the direction of the thickness of the door, and the greater in the direction of the lateral extent of the door. The marginal portion extends transversely beyond the intermediate portion by a. space interval equal, with tolerance, to the width of a standard brick. The spacesat which the transverse bars stand apart from one another and from the lengths of pipe which constitute the sides of the door frame are, with proper tolerance, equal to the breadth of a brick (4l/2 inches). The drawings show an integrated frame made up of Vfour peripheral lengths of pipe and three intermediate and transverse lengths. In the peripheral lengths openings are cut to receive the ends of the transverse lengths, and the components are welded along all linesof meeting.

into .the frame, and at proper intervals parbod 3 will ordinarily be The body of refractory materialiis built l ticular bricks 30 are laid, extending lengthv wise throughout the overall thickness of the door (9 inches)l and into the spaces between the pipes. Thus the refractory face ofthe door is bonded to the metal frame. All the l sition. A,

spaces formed by transverse members 2 will preferably be filled with masonry.

By reason of the fact that the briek'work extends vinto the spaces between the bars or pipe 2., it is'securely held in .place and is very effectively cooled. By reason of the high temperature to which furnace doors are sub-V jected, he life of the brickwork lining becomes an important item, and the vsuperior cooling afforded by my construction constitutes an importantadvantage of this invention.

Circulation pipes are indicated at 4. The use of such pipes is familial'. Anypreferred arrangement of them may be adopted. With the `matter of circulation in mind it will be remarked that the door preferably 'stands with the transversemembers Qis vertical po- The usual :peep licle 5 may be formed through one' of. the members 2 and continued through theifacing 3. ,I The door is provided witlrsuspension lugs 6', as is usual..v`

25. "preferred t understood, however, that it is not limited to the form shown v 'bodied -within the scope of the following claims.

I have illustiated and described a present form of the invention. It will be but may be otherwise eminvention I claim as my grid for brickwork which 1. A supporting with the supported brickwork constitutes a with tolerance,

furnace door, such grid being formed of lengths of metallic conductor for liquid, fitv ted together, the structureincluding amarginal portion and an intermediate portion extending transversely between opposite members of the marginal portion, the marginal'portion extending transversely beyond the intermediate portion' by a space interval equal, with tolerance, to the width of a standard brick, and the rid spaces being e ual, to t e width of a stan ard brick.

2. A supporting grid for brickwork which lwith the supported brickwork constitutes a furnace door, such grid being formed of lengths of metallic conductor for liquid of cross-sectional dimensions corresponding to the length vand width of a standard brick, the structure including a marginal portion in which the lconductor is arranged with its aov extent ofthe structure,

greater dimension transverse to the ngeneral and an intermediate portion extending transversely betweenopt e in such intermediate portion being with its less dimension transverse conductor arranged to the general extent ofthe structure, the conductor walls on one side of the structure extending in common plane and on the other side forming. a re-entrant brick-receiving 4space lof a depth equal, with tolerance, to the width tending portions of a standard brick, and the grid spaceshaving a width equal, with tolerance, to the width of a standard brick. 3. A wrought metalfurnace door comprismg a hollow metal rim, a tubeextending across the rim and opening thereinto, and means whereby cooling water may be circulated through the door. l s 4. A wrought metal furnace door comprislng a hollow metal rim, a tube of less thickness than the rim extending across the rim and opening thereinto, and means whereby cooling water may be circulated through the door. v

5. A furnace door' comprising a hollow metal' rim, a plurality of spaced tubes extending across the rim and opening thereinto, and means whereby cooling water may be circulated through the door.

" 6. A` furnace door comprising a hollow metal rim, a vertically extending tube extend' ing across the rim and opening thereinto, and meanswhereby cooling water may be circulated through the door.

' tube,and means whereby cooling water may bel circulated through the door.

8. A furnace door comprising a hollow metal rim, vertically extending tubes extending across the rim and opening thereinto, and

a supply pipe into the tubes.

for cooling waterigprojecting i 9. A furnace door comprising a' hollow l metal`ri111,'tubes'of less thickness'than the rim extending from onezir'a'rgin of the rim to an opposite margin thereof and opening into theA rim, meansigfo"'circulating water through the rim and the tubes, and brickwork'lying within the' rim between the planes of the front and rear faces thereof, the brickwork forming a substantially continuous facing covering those are closest to the furnace when the door is in service, the brickwork extending rearwardly ybetween the tubes, whereby upon burning away of the brickwork facing to a point where suchburning is substantially limited by the 4cooling effect of the tubes, such exhold the thinned facing in place.

10. A supporting grid for brickwork which with the supported furnace door, such grid being formed-0f lengths of metallic conductor for liquid, the.

structure including'a marginal ortionin which the v.conductor is arrange v with its greater dimension transverse to the general extent of the structure, and an intermediate e portionextending transversely between oppsite members o the vmarginal portion, the

faces of the tubes whichbrickwork constitutes aconductor in such intermediate portion be ing arranged with its` less dimension transverse to the general extent of the structure, the conductor walls on one side of the structure extending in common plane and on the other side forming a re-entrant brick-receiving space.

11. A wrought metal furnace door having p a closed top and comprising a hollow rim lo with spaced tubular members extending across the rim and forming a continuous water space therewith.

' In testimony whereof I have hereunto set my hand. EDWARD WILLIAMS. 

